1998 GMC Suburban Owner's Manual - Page 403

Also look for any opened or broken air bag coverings, and have them repaired or replaced. (The air bagsystem does not need regular maintenance.) Automatic Transmission Check Check the transnlission fluid level; add if needed. See "Automatic Transmission" in the Index. A fluid loss may indicate a problem. Check the system and repair if needed. Wiper Blade Check Inspect wiper blades for wear or cracking. Replace blade inserts that appear worn or damaged or that streak or miss areas of the windshield. Also see "Wiper Blades, Cleaning" i n the Index. At Least Once a Year Key Lock Cylinders Service Lubricate the key lock cylinders with the lubricant specified i n Part D. Air Cleaner Filter Restriction Indicator Check Your vehicle has a n indicator on the engine that lets you know when the air cleaner filteris dirty and needs to be changed. Check indicatorat least twice a year or when your oil is changed. See "Air Cleaner'?in the Index for more information. Inspect your air cleaner filter restriction indicator more often if the vehicle is used in dusty areas or under off road conditions. Body Lubrication Service Lubricate all fuel door, body hood and body door hinges, rear compartment hinges, tailgate handle pivot points, latches, locks anti folding seat I~ardware. Part D tells you what to use. More frequent lubrication may be required when exposed to a corrosive environment. 7-39